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|
package setup
import (
"sync"
"github.com/miekg/coredns/middleware"
"github.com/miekg/coredns/middleware/metrics"
)
const addr = "localhost:9153"
var metricsOnce sync.Once
func Prometheus(c *Controller) (middleware.Middleware, error) {
m, err := parsePrometheus(c)
if err != nil {
return nil, err
}
metricsOnce.Do(func() {
c.Startup = append(c.Startup, m.Start)
c.Shutdown = append(c.Shutdown, m.Shutdown)
})
return func(next middleware.Handler) middleware.Handler {
m.Next = next
return m
}, nil
}
func parsePrometheus(c *Controller) (metrics.Metrics, error) {
var (
met metrics.Metrics
err error
)
for c.Next() {
if len(met.ZoneNames) > 0 {
return metrics.Metrics{}, c.Err("metrics: can only have one metrics module per server")
}
met = metrics.Metrics{ZoneNames: c.ServerBlockHosts}
for i, _ := range met.ZoneNames {
met.ZoneNames[i] = middleware.Host(met.ZoneNames[i]).Normalize()
}
args := c.RemainingArgs()
switch len(args) {
case 0:
case 1:
met.Addr = args[0]
default:
return metrics.Metrics{}, c.ArgErr()
}
for c.NextBlock() {
switch c.Val() {
case "address":
args = c.RemainingArgs()
if len(args) != 1 {
return metrics.Metrics{}, c.ArgErr()
}
met.Addr = args[0]
default:
return metrics.Metrics{}, c.Errf("metrics: unknown item: %s", c.Val())
}
}
}
if met.Addr == "" {
met.Addr = addr
}
return met, err
}
|
